I've only seen Part Two, and I went with a friend who had comps so the cost didn't factor into anything for me, but I found it really excellent. I'm not terribly familiar with the history behind it, and it's not a genius piece of writing, but I found it very engaging, with excellent acting and directing. There may be some discounts out there if the cost is something that worries you, but given your interest in the subject matter I think it's worth your time.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.